function g = sigmoid(z)
%SIGMOID Compute sigmoid functoon
%   J = SIGMOID(z) computes the sigmoid of z.

% You need to return the following variables correctly 
g = zeros(size(z));

% ====================== YOUR CODE HERE ======================
% Instructions: Compute the sigmoid of each value of z (z can be a matrix,
%               vector or scalar).

for i=1:size(z,1), 
    for j=1:size(z,2), 
		g(i,j) = 1/(1+exp(-1*z(i,j)));
	end
end



% =============================================================

end
